Yes, I run two T5's on a 660 as supplemental lighting to halides.
No problems. Check your wiring, check for a bad bulb. I'm not sure if the Icecap thermally protects the bulbs but if it does, and you ahve no fan cooling across the lamps and they are in a hot or enclosed space, that would do it. But check with ice cap on the thermal issue if it's not the wiring or bulb.
Also, you cant exceed a certian bulb number or bulb length for either ballast.
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